I have reincarnated into what appears to be a fantasy world straight out of an otome isekai, as Trevor Livrebrook, the son of a baron.

Oh? That poor duchess's daughter is currently having her engagement with the second prince annulled, and worse, the second prince and his new fiancée seem to be humiliating her in public? I will not stand for this injustice!

Eh? Why is Lady Lumiere Ombre angry? What's this about ruining her plans? Wait, why is she behaving as if she knows the future?

A fantasy romance story between a reincarnator and a regressor!